fix: grant contents:write to release flow buildassets job

[thomasrockhu-codecov]

Summary

• The Build and Publish CLI Release workflow (release_flow.yml) failed with startup_failure (e.g. run 28972104407).
• Root cause: commit 987d53c bumped build_assets.yml's workflow-level permission to contents: write (needed so upload-release-action can attach release assets via GITHUB_TOKEN). A reusable workflow cannot request more permission than the caller grants, but release_flow.yml calls it from the buildassets job with only the default contents: read, so the workflow failed to compile and no jobs ran.
• Fix: grant contents: write on the buildassets job so the reusable workflow can compile and successfully upload assets.

Test plan

• Merge to main, then re-cut the v11.3.0 release/tag so GitHub loads the corrected workflow files for the release: created event.
• Confirm the Build and Publish CLI Release run starts (no startup_failure) and the buildassets job uploads release assets.

Made with Cursor

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
723	1	722	1

View the full list of 1 ❄️ flaky test(s)

api.temp.calculator.test_calculator::test_divide

Flake rate in main: 100.00% (Passed 0 times, Failed 982 times)

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

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